CN104914293B - Power-fail detection circuit and device - Google Patents
Power-fail detection circuit and device Download PDFInfo
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Abstract
The invention discloses a kind of power-fail detection circuit and device, the power-fail detection circuit is connected between the live wire of civil power and zero line, it includes rectification module, Voltage stabilizing module and detection module, the input of rectification module is connected with live wire, zero line respectively, the output end of rectification module and the input of Voltage stabilizing module connect, and the output end of Voltage stabilizing module and the input of detection module connect；Wherein, form direct current signal after rectification module handles AC signal rectification to transmit to Voltage stabilizing module, Voltage stabilizing module is carried out transmitting after voltage regulation filtering processing to detection module to direct current signal, and detection module is according to the magnitude of voltage output switch amount signal of direct current signal；When on-off model is turns on on-off model, civil power is normal operating conditions；When on-off model is disconnects on-off model, civil power is power-down state；So as to be exported by above-mentioned on-off model, civil power power-down state can be found in time, to inform follow-up intelligent equipment with the timely processing power down situation.
Description
Technical Field
The invention relates to the field of electrical measurement, in particular to a power failure detection circuit and a power failure detection device.
Background
At present, mains supply power failure occurs frequently, when the mains supply is suddenly powered down, great impact is generated on a plurality of running devices, and data in the power failure cannot be stored in time; if the mains supply fails, the mains supply can not be found and processed in time, and more serious safety accidents can be caused.
Disclosure of Invention
The invention mainly aims to provide a power failure detection circuit, aiming at detecting the power failure condition of commercial power in time.
In order to achieve the purpose, the invention provides a power failure detection circuit which is connected between a live wire and a zero line of a commercial power, and comprises a rectification module, a voltage stabilizing module and a detection module, wherein the input end of the rectification module is respectively connected with the live wire and the zero line, the output end of the rectification module is connected with the input end of the voltage stabilizing module, and the output end of the voltage stabilizing module is connected with the input end of the detection module; the rectification module rectifies an alternating current signal to form a direct current signal, the direct current signal is transmitted to the voltage stabilizing module, the voltage stabilizing module performs voltage stabilizing filtering processing on the direct current signal and then transmits the direct current signal to the detection module, and the detection module outputs a switching value signal according to a voltage value of the direct current signal; when the switching value signal is a conducting switching value signal, the commercial power is in a normal working state; and when the switching value signal is a disconnected switching value signal, the commercial power is in a power-off state.
Preferably, the detection module comprises an optocoupler, an anode of a light emitting diode inside the optocoupler is connected with an output end of the voltage stabilizing module, and a cathode of the light emitting diode is grounded; the collector and the emitter of the phototriode in the optocoupler are output ends of switching value signals; when the voltage value of the direct current signal output by the voltage stabilizing module is greater than or equal to the conduction voltage value of the light emitting diode, the detection module outputs a conduction switching value signal; when the voltage value of the direct current signal output by the voltage stabilizing module is smaller than the conduction voltage value of the light emitting diode, the detection module outputs a switch-off switching value signal.
Preferably, the detection module further includes a first resistor for limiting current, one end of the first resistor is connected to the output end of the voltage stabilizing module, and the other end of the first resistor is connected to the anode of the light emitting diode.
Preferably, the detection module further includes a first capacitor for filtering, one end of the first capacitor is connected to a common node between the first resistor and the anode of the light emitting diode, and the other end of the first capacitor is grounded.
Preferably, the voltage stabilizing module includes a voltage dividing unit and a voltage stabilizing diode, the voltage dividing unit includes a second resistor and a third resistor, one end of the second resistor is connected to the output end of the rectifying module, the other end of the second resistor is connected to one end of the third resistor, the other end of the third resistor is grounded, and a common node between the second resistor and the third resistor is used as the output end of the voltage stabilizing module and is connected to the input end of the detecting module; and the cathode of the voltage stabilizing diode is connected with the second resistor and the third resistor, and the anode of the voltage stabilizing diode is grounded.
Preferably, the voltage stabilizing module further includes a second capacitor for filtering, an anode of the second capacitor is connected to a common node of the third resistor and a cathode of the zener diode, and a cathode of the second capacitor is grounded.
Preferably, the voltage stabilizing module further includes a third capacitor for filtering, one end of the third capacitor is connected to a common node of the second resistor and the cathode of the zener diode, and the other end of the third capacitor is grounded.
Preferably, the rectifier module comprises a rectifier diode and a fourth capacitor, an anode of the rectifier diode is connected with the live wire, a cathode of the rectifier diode is connected with one end of the fourth capacitor, the other end of the fourth capacitor is connected with a zero line, and the zero line is grounded; and a common node between the cathode of the rectifier diode and the fourth capacitor is used as the output end of the rectifier module and is connected with the input end of the voltage stabilizing module.
Preferably, the rectifier module further includes a fourth resistor for limiting current, one end of the fourth resistor is connected to the live wire, and the other end of the fourth resistor is connected to the anode of the rectifier diode.
In addition, in order to achieve the above object, the present invention further provides a power failure detection apparatus, which includes an input port, an output port, and at least one power failure detection circuit; one side of the input port is connected with a live wire and a zero wire of single-phase commercial power, or one side of the input port is connected with the live wire and the zero wire of each phase of three-phase commercial power, and the other side of the input port is connected with the input end of the corresponding rectifying module of the power failure detection circuit; and the output port is connected with the output end of the corresponding detection module of the power failure detection circuit.
The invention provides a power failure detection circuit and a device, firstly, a high-voltage alternating current signal between a live wire and a zero line is rectified into a direct current signal through a rectification module; and output to detection module after handling through voltage stabilizing module step-down steady voltage, this detection module detects the voltage value of voltage stabilizing module output to judge commercial power down state according to this voltage value output switching value signal: when the switching value signal is a conducting switching value signal, the commercial power is in a normal working state; when the switching value signal is the off switching value signal, the commercial power is in a power-off state. Therefore, the power failure state of the mains supply can be found in time through the switching value signal output of the power failure detection circuit and the device, so that subsequent intelligent equipment is informed to process the power failure condition in time.
Drawings
FIG. 1 is a functional block diagram of an embodiment of a power down detection circuit of the present invention;
FIG. 2 is a schematic diagram of the circuit configuration of FIG. 1;
fig. 3 is a schematic structural diagram of an embodiment of the power failure detection apparatus of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a power failure detection circuit.
Referring to fig. 1, fig. 1 is a functional module schematic diagram of a power down detection circuit according to an embodiment of the present invention; in this embodiment, the power failure detection circuit 10 is connected between a live line L and a zero line N of a commercial power, the power failure detection circuit 10 includes a rectification module 100, a voltage stabilizing module 200, and a detection module 300, an input end of the rectification module 100 is connected with the live line L and the zero line N, an output end of the rectification module 100 is connected with an input end of the voltage stabilizing module 200, and an output end of the voltage stabilizing module 200 is connected with an input end of the detection module 300; the rectifying module 100 rectifies an alternating current signal to form a direct current signal, transmits the direct current signal to the voltage stabilizing module 200, the voltage stabilizing module 200 performs voltage stabilizing filtering on the direct current signal and transmits the direct current signal to the detecting module 300, and the detecting module 300 outputs a switching value signal according to a voltage value of the direct current signal; when the switching value signal is a conducting switching value signal, the commercial power is in a normal working state; and when the switching value signal is a disconnected switching value signal, the commercial power is in a power-off state.
The power failure detection circuit 10 can be connected between the live wire L and the zero line N of a single-phase commercial power, and can also be respectively connected between the live wire L and the zero line N of each phase of a three-phase commercial power. Because high-voltage alternating current is adopted between the live wire L and the zero line N, if equipment for directly measuring the power failure of the live wire L is used, a very high withstand voltage value is required, and a very large potential safety hazard exists; therefore, in the present embodiment, the rectifier module 100 is first adopted to rectify the high-voltage ac signal between the live line L and the neutral line N into a dc signal; because the voltage of the ac signal may have a wide range due to the load variation of the power grid, the voltage of the ac signal is stabilized by the voltage stabilizing module 200 and then a stable dc signal is output, in an embodiment, the processing procedure of the voltage stabilizing module 200 is preferably voltage reduction and stabilization; when the utility power is in a normal state, the voltage value of the dc signal output by the voltage stabilizing module 200 is a voltage value in a stable range, and when the utility power is in a power-off state, the voltage value of the dc signal output by the voltage stabilizing module 200 is smaller than the voltage value in the stable range, so that whether the utility power is in the power-off state can be judged by detecting the voltage value of the dc signal output by the voltage stabilizing module 200 through the detecting module 300. When the voltage value of the dc signal detected by the detection module 300 is greater than or equal to the preset voltage value inside the detection module, the detection module 300 outputs a signal for turning on/off the switching value, and at this time, the commercial power is in a normal working state; when the voltage value of the dc signal detected by the detection module 300 is smaller than the preset voltage value inside the detection module, the detection module 300 outputs a signal for turning off the switch, and at this time, the commercial power is in a power-off state.
Through the switching value signal output by the power failure detection circuit 10, whether the commercial power is in a power failure state can be judged in time, the power failure detection circuit 10 is wide in application range, and the switching value signal can be used as an input signal to be connected to other processing modules, such as alarming and power failure protection.
Specifically, referring to fig. 2, fig. 2 is a schematic circuit structure diagram of an embodiment of the power down detection circuit of the present invention; in this embodiment, the detection module 300 includes an optocoupler U1, an anode of a light emitting diode inside the optocoupler U1 is connected to the output terminal of the voltage regulator module 200, and a cathode of the light emitting diode is grounded; the collector and the emitter of a phototriode in the optocoupler U1 are output ends of switching value signals; when the voltage value of the dc signal output by the voltage stabilizing module 200 is greater than or equal to the turn-on voltage value of the led, the detecting module 300 outputs a turn-on switching value signal; when the voltage value of the dc signal output by the voltage stabilizing module 200 is smaller than the on voltage value of the led, the detecting module 300 outputs an off switching value signal.
The optocoupler U1 comprises a light emitting diode and a phototriode inside, when the voltage value of the direct current signal output by the voltage stabilizing module 200 is greater than or equal to the conduction voltage value of the light emitting diode, the light emitting diode is conducted, the light emitting diode emits infrared light, when the phototriode receives the infrared light, the collector and emitter of the phototriode are in a conduction state, and at the moment, the collector and emitter of the phototriode serve as the output end of the switching value signal to output a conduction switching value signal; when the voltage value of the dc signal output by the voltage stabilizing module 200 is smaller than the on-state voltage value of the light emitting diode, the light emitting diode is turned off, the light emitting diode does not emit infrared light, the collector and emitter of the phototriode are in an off state, and at this time, the collector and emitter of the phototriode serve as the output end of the switching value signal to output the off-switching value signal.
In addition, because the signal transmission of the optocoupler U1 adopts the form that an electric signal is converted into an optical signal and then is converted into the electric signal, the input stage and the output stage of the optocoupler U1 are well electrically isolated, the interference between the input stage and the output stage is reduced, and the subsequent circuit is protected.
It should be noted that the detection module 300 may also use a MOS transistor, a triode, a relay, or other devices to detect the voltage value of the dc signal at the output end of the voltage stabilizing module 200 and output the switching value signal.
Further, the detection module 300 further includes a first resistor R1 for limiting current, one end of the first resistor R1 is connected to the output terminal of the voltage regulator module 200, and the other end of the first resistor R1 is connected to the anode of the light emitting diode.
The input end of the optocoupler U1 is also connected with a first resistor R1, and the first resistor R1 is used for limiting the current input to the light-emitting diode so as to prevent the optocoupler U1 from being burnt out by the excessive current output by the voltage stabilizing module 200; the resistance of the first resistor R1 can be set according to the requirement, and is not limited herein.
Further, the detection module 300 further includes a first capacitor C1 for filtering, one end of the first capacitor C1 is connected to the common node between the first resistor R1 and the anode of the light emitting diode, and the other end of the first capacitor C1 is grounded.
The direct current signal output by the voltage stabilizing module 200 is subjected to current limiting through a first resistor R1, and then is subjected to filtering processing through a first capacitor C1, wherein the first capacitor C1 is mainly used for filtering spike pulse voltage and electrostatic voltage so as to prevent the spike voltage and the classic voltage from impacting and damaging the optocoupler U1; the first resistor R1 and the first capacitor C1 provide double protection for the optocoupler U1, so that the operation of the optocoupler U1 is not interfered by other signals, and the service life of the optocoupler U1 is prolonged.
Further, the voltage regulation module 200 includes a voltage division unit and a voltage regulation diode D1, the voltage division unit includes a second resistor R2 and a third resistor R3, one end of the second resistor R2 is connected to the output end of the rectification module 100, the other end of the second resistor R2 is connected to one end of the third resistor R3, the other end of the third resistor R3 is grounded, and a common node between the second resistor R2 and the third resistor R3 is connected to the input end of the detection module 300 as the output end of the voltage regulation module 200; the cathode of the zener diode D1 is connected to the second resistor R2 and the third resistor R3, and the anode of the zener diode D1 is grounded.
The second resistor R2 and the third resistor R3 are connected in series between the output end of the rectifier module 100 and the ground to form a voltage dividing unit, a common node of the second resistor R2 and the third resistor R3 is used as the output end of the voltage stabilizing module 200 and is connected with the input end of the detection module 300, and a voltage signal detected by the detection module 300 is obtained by dividing the voltage of the third resistor R3; therefore, direct sampling of the high-voltage direct-current signal output by the rectifier module 100 is avoided, the requirement on the voltage withstanding strength of the detection module 300 is reduced, and the resistance values of the second resistor R2 and the third resistor R3 can be selectively limited according to the voltage withstanding range of the detection module 300, and specific values are not limited herein.
Because the voltage output by the rectifier module 100 is affected by the instability of the alternating current grid, and the alternating current voltage input to the rectifier module 100 is unstable, the high-voltage direct current signal output by the rectifier module 100 is unstable, so that the voltage division of the third resistor R3 is unstable, and the possibility that the over-high constant voltage impacts the optocoupler U1 may exist; in order to avoid this, a zener diode D1 is connected in parallel to two ends of the third resistor R3, so that the voltage across the third resistor R3 is stabilized below a certain value, and a specific stabilizing range can select the corresponding zener diode D1 according to actual requirements.
Further, the voltage stabilizing module 200 further includes a second capacitor C2 for filtering out dc ripple and a third capacitor C3 for filtering, an anode of the second capacitor C2 is connected to a common node of the third resistor R3 and a cathode of the zener diode D1, and a cathode of the second capacitor C2 is grounded; one end of the third capacitor C3 is connected to the common node between the second resistor R2 and the cathode of the zener diode D1, and the other end of the third capacitor C3 is grounded.
On the basis of limiting the output of the voltage stabilizing module 200 by using the voltage stabilizing tube, a second capacitor C2 and a third capacitor C3 are also connected in parallel to two ends of the third resistor R3 for filtering out high-frequency ripples, the second capacitor C2 preferably uses an electrolytic capacitor, and the third capacitor C3 preferably uses a small-capacity capacitor made of ceramic chips or monolithic; the second capacitor C2 and the second resistor R2 form a low-pass filter, which is mainly used for filtering out a ripple signal of a dc signal output by the rectifier module 100, and the third capacitor C3 is used for making up for the situation that the high-frequency ripple filtered out by the low-pass filter is insufficient, so as to further protect the subsequent detection module 300; the second capacitor C2 and the third capacitor C3 can also protect the zener diode D1, and prevent the zener diode D1 from being broken down by high frequency dc signals.
Further, the rectifier module 100 includes a rectifier diode D2 and a fourth capacitor C4, an anode of the rectifier diode D2 is connected to the live line L, a cathode of the rectifier diode D2 is connected to one end of the fourth capacitor C4, the other end of the fourth capacitor C4 is connected to a neutral line N, and the neutral line N is grounded; a common node between the cathode of the rectifying diode D2 and the fourth capacitor C4 is connected as an output terminal of the rectifying module 100 to an input terminal of the voltage regulator module 200.
In this embodiment, the rectifier diode D2 constitutes a half-wave rectifier circuit, and the high-voltage dc signal formed after rectification is a dc pulsating voltage signal, and has more clutter interference, and the clutter in the dc pulsating voltage signal is filtered through the fourth capacitor C4, so as to effectively improve the accuracy and speed of the detection by the detection module 300. The fourth capacitor C4 is preferably a high-voltage dacron capacitor with a small capacitance value.
It should be noted that the above-mentioned rectification circuit may also adopt other modes such as full-wave rectification, which are not described herein.
Further, the rectifier module 100 further includes a fourth resistor R4 for limiting current, one end of the fourth resistor R4 is connected to the live line L, and the other end of the fourth resistor R4 is connected to the anode of the rectifier diode D2.
The fourth resistor R4 is used to limit the current at the input end of the rectifier module 100, which effectively prevents the rectifier diode D2 and the fourth capacitor C4 from being damaged by the excessive current in the ac power grid.
The invention also provides a power failure detection device, and referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of the power failure detection device; in this embodiment, the power down detection apparatus includes an input port 20, an output port 30, and a three-way power down detection circuit 10; one side of the input port 20 is connected with the live line L and the zero line N of each phase of the three-phase commercial power, and the other side of the input port 20 is connected with the input end of the corresponding rectifying module 100 of each power failure detection circuit 10; the output port 30 is connected to the output end of the corresponding detection module 300 of each power failure detection circuit 10; the power failure detection device can also be suitable for power failure detection of single-phase mains supply, only one path of power failure detection circuit 10 is needed in the single-phase mains supply detection device, one side of the input port 20 is connected with a live wire L and a zero line N of the single-phase mains supply, and the other side of the input port is connected with the input end of a rectification module 100 of the power failure detection circuit 10; the output port 30 is connected to an output terminal of the detection module 300 of the power down detection circuit 10. The structure, the operating principle and the advantageous effects of the power failure detection circuit 10 refer to the description of the above embodiments, and are not repeated herein.
Through above-mentioned detection device that falls, can short-term test single-phase commercial power and three-phase commercial power's the power failure state.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (2)
1. A power failure detection circuit is connected between a live wire and a zero line of a commercial power and is characterized by comprising a rectification module, a voltage stabilizing module and a detection module, wherein the input end of the rectification module is respectively connected with the live wire and the zero line, the output end of the rectification module is connected with the input end of the voltage stabilizing module, and the output end of the voltage stabilizing module is connected with the input end of the detection module; the rectification module rectifies an alternating current signal to form a direct current signal, the direct current signal is transmitted to the voltage stabilizing module, the voltage stabilizing module performs voltage stabilizing filtering processing on the direct current signal and then transmits the direct current signal to the detection module, and the detection module outputs a switching value signal according to a voltage value of the direct current signal; when the switching value signal is a conducting switching value signal, the commercial power is in a normal working state; when the switching value signal is a switching-off switching value signal, the commercial power is in a power-off state; wherein,
the detection module comprises an optical coupler, the anode of a light emitting diode in the optical coupler is connected with the output end of the voltage stabilizing module, and the cathode of the light emitting diode is grounded; the collector and the emitter of the phototriode in the optocoupler are output ends of switching value signals; when the voltage value of the direct current signal output by the voltage stabilizing module is greater than or equal to the conduction voltage value of the light emitting diode, the detection module outputs a conduction switching value signal; when the voltage value of the direct current signal output by the voltage stabilizing module is smaller than the conduction voltage value of the light emitting diode, the detection module outputs a switch-off switching value signal;
the detection module further comprises a first resistor for limiting current, one end of the first resistor is connected with the output end of the voltage stabilizing module, and the other end of the first resistor is connected with the anode of the light emitting diode;
the detection module further comprises a first capacitor for filtering, one end of the first capacitor is connected with a common node between the first resistor and the anode of the light emitting diode, and the other end of the first capacitor is grounded;
the voltage stabilizing module comprises a voltage dividing unit and a voltage stabilizing diode, the voltage dividing unit comprises a second resistor and a third resistor, one end of the second resistor is connected with the output end of the rectifying module, the other end of the second resistor is connected with one end of the third resistor, the other end of the third resistor is grounded, and a common node between the second resistor and the third resistor is used as the output end of the voltage stabilizing module and is connected with the input end of the detecting module; the cathode of the voltage stabilizing diode is connected with the second resistor and the third resistor, and the anode of the voltage stabilizing diode is grounded;
the voltage stabilizing module further comprises a second capacitor for filtering, the anode of the second capacitor is connected with the third resistor and the common node of the cathode of the voltage stabilizing diode, and the cathode of the second capacitor is grounded;
the voltage stabilizing module further comprises a third capacitor for filtering, one end of the third capacitor is connected with the second resistor and a common node of the cathode of the voltage stabilizing diode, and the other end of the third capacitor is grounded;
the rectifying module comprises a rectifying diode and a fourth capacitor, the anode of the rectifying diode is connected with the live wire, the cathode of the rectifying diode is connected with one end of the fourth capacitor, the other end of the fourth capacitor is connected with a zero line, and the zero line is grounded; a common node between the cathode of the rectifier diode and the fourth capacitor is used as the output end of the rectifier module and is connected with the input end of the voltage stabilizing module;
the rectifying module further comprises a fourth resistor for limiting current, one end of the fourth resistor is connected with the live wire, and the other end of the fourth resistor is connected with the anode of the rectifying diode.
2. A power down detection device, characterized in that it comprises an input port, an output port, and at least one power down detection circuit according to claim 1; one side of the input port is connected with a live wire and a zero wire of single-phase commercial power, or one side of the input port is connected with the live wire and the zero wire of each phase of three-phase commercial power, and the other side of the input port is connected with the input end of the corresponding rectifying module of the power failure detection circuit; and the output port is connected with the output end of the corresponding detection module of the power failure detection circuit.
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| CN201510232713.5A CN104914293B (en) | 2015-05-08 | 2015-05-08 | Power-fail detection circuit and device |
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| CN201510232713.5A CN104914293B (en) | 2015-05-08 | 2015-05-08 | Power-fail detection circuit and device |
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| CN115436693B (en) * | 2022-08-22 | 2023-12-05 | 中国科学院合肥物质科学研究院 | Voltage detection device and method for judging whether high voltage of input end exceeds preset value |
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| CN102375087A (en) * | 2011-09-22 | 2012-03-14 | 中国北车集团大连机车车辆有限公司 | Low-voltage detection circuit for logic device |
| CN204595075U (en) * | 2015-05-08 | 2015-08-26 | 深圳市盈科互动科技有限公司 | Power-fail detection circuit and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0560804A (en) * | 1991-08-31 | 1993-03-12 | Nec Corp | Method and device for detecting drop in input ac voltage of dc switching power source |
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| CN201051123Y (en) * | 2007-06-07 | 2008-04-23 | 徐康能 | Power system over-current detection and alarming device |
| CN102338823A (en) * | 2010-07-27 | 2012-02-01 | 深圳长城开发科技股份有限公司 | Power failure detection method and circuit for electric meter system |
| CN102062808A (en) * | 2010-11-23 | 2011-05-18 | 天津市亚安科技电子有限公司 | Front-end equipment power supply voltage detection circuit for video monitoring system, and electronic monitoring equipment |
| CN102375087A (en) * | 2011-09-22 | 2012-03-14 | 中国北车集团大连机车车辆有限公司 | Low-voltage detection circuit for logic device |
| CN204595075U (en) * | 2015-05-08 | 2015-08-26 | 深圳市盈科互动科技有限公司 | Power-fail detection circuit and device |
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